Dynamic torque balancer



July 11, 1939. R. CHILTON DYNAMIC TORQUE BALANCER Filed'Oct. 16, 1937 f INVENTOR ROLfi/YD CHILTON ATTORNE Patented July ll, 193a 2,165,463

UNlTED STATES A NT-OFFICE DYNAMIC TORQUE BALsNcEn Roland Chilton, Rldgewood,'N. 3., assignor, by

mesne assignments, to Wright Aeronautical Corporation, Paterson, N. J., a corporation of New York Application October 16, 1931, Serial No. 169,348

'1 Claims. (on. 14- 04) This invention relates to the class of torsional journal l6 and further with an extension 18 havvibration damper wherein a pendulum mass is ing the same general profile as a conventional suspended from the shaft so as to have, when counterweight, as seen in Fig. 1. This projection stabilized by-centrifugal force, a frequency which is recessed on either side to form pockets 20 in increases in direct proportion to the rotational each of which thereisdisposed acircular count'er- 5 speed'of the shaft wherefore the pendulum makes weight mass 22 of disc form. The extension I8 is the same number of swings per crankshaft revolu provided with raceways 24, one of which is. seen in tion at all revolutional speeds. It is known that the left hand side of Fig. 1, and supported on such" pendulums, if made synchronous with the rollers 26, in these raceways, are eccentrics 28 '10 impulses towhich the shaft is subject, willswing having integral eccentric pins 3|! projecting on '180fT-o'ut ofwphas'e with those impulses which are, either side. These eccentric pins are provided accordingly, neutralized to the elimination of with rollers 32 whereby they carry the countert'orsi'onal vibrations; weight discs 22,,the assembly being retained in The required effective pendulum length of place by a retaining bolt 36 and companion nut 38.

u multi-cylinder engines, such as contemplated in v The radius arrow X in Fig. 1 denotes the ec- 16 the showings, is relatively small (of the order centricity of the eccentric members 28-30 upon of which is a smaller effective length than which the discs oscillatethrough a small n l can be obtained by simple singlepivotalsuspenas indicated by the dotted linesY denoting the sion with thelarge dampening masses here deextreme posi i n of swin siredb; It will be seen that the eccentric pins are no Accordingly, bi-filar" suspension ha been free to rotate within he counterweight masses resorted to in the art, wherein eccentric means 22 h y the eeeeht 05 my swing W ut of the desired small radius support the weight at tr d i e any polar r at na m vem nt in spaced points whereby allfelements of the weight t Weights, each Point efawhieh w o ow an follow arcuate paths equal tothe radius described ar ua e p th identical with that des by at by the eccentric-mea,1"1s. the radius x. The pendulum frequency is, ac-

Single eccentric suspension means in combinacordingly, that of a simple" pendulum of tion with auxiliary guiding'means to prevent rotapendulum length X. The pivoting of the masses tional movement of the weight relative to the 22 O e eeeentl'ie P 39 Permits rotational w shaft have also been proposed (Bleecker applicacreep of the masses without having any effect on 80 tion Serial Number 169,358, filed October 16, 1937, the frequency of swing thereof, since the masses and Chilton application Serial Number 172,557, are concentric with the pins 30. Due to this confiled November 3, 1937. The present invention centricity, no stabilization of the masses is needed. teaches how theauxiliary guiding means may be Although two sets of masses 22 are shown, a

5 omitted by sub-dividing the active weight into greater plurality couldbe used. The distance X circular masses which may be left free to drift for any set of masses may be adjusted so that the in rotation without in any way disturbing the several sets may have divergent frequencies of balance and/ or dynamic damping effects. Where oscillation in accordance with torsional impulses large masses are needed as in radial aircraft of different frequencies that may be present in 0 engines, a plurality of weights are needed to get the power plant.

the desired aggregate active mass within the conwhile I have described my invention in detail fines of the available space which in current in its present preferred embodiment, it will be 4 desi n i f y occupied by he conventional obvious .to those skilled in the art, after underr zid welgh standing my invention, that various changes and other bje s and advan of the invention modifications may be made therein without de- 46 will be Obv ous. f om t following description parting from .the spirit or scope thereof. I aim w reference to the drawing, in Whichin the appended claims to cover all such modi- Fig. 1 is an axial view, in section througlrthe t-4 d e erankpin, and I claim as my invention:

so F 2 s a d v w i p section n h 1. The combination withashaft member having 60 line of an opening, of a counterweight mass comprising a In thedrawing, l0 designates the crankpin of disc having t l opening, and means coma conventional crankshaft to which is clamped a prising relatively eccentric journals r spectiv ly rear cheek 12 by the usual clamp bolt 14. The rotatably engaging in said openings for the a crank cheek I2 is providedrwith the usual rear pendulous support of t disc whereby the disc is forced to partake of the arcuate travel of the journal means and is free to drift rotationally thereon.

2. In combination with a shaft extension member having an opening, a plurality of masses each its center of gravity, and

weight, said weight being thus free to swing with but to rotate relative to said eccentric Journal member. l

4. In combination,'a shaft extension member having an opening, a pin freely rotatable therein,

a central bearing one said journal.

5. In combination, a shaft extension member having an opening, a counterweight disc on each rotatably engaging side of said member, said discs having central aligned openings eccentric to the member openon said member, and pin means axially relative to said extension member.

7. In combination, a shaft extension having an opening, pin means concentric with and substantially filling said ROLAND CHILTON. 

